The one and only method of removing computer viruses and other malicious stuff is using an efficient antivirus software application. A good quality antivirus application provides real-time protection for e-mail programs and the files they receive. There are a number of antivirus programs available in the market such as Symantec Norton Antivirus, Antivirus McAffe, and Kaspersky Antivirus.
While buying an antivirus, you should keep certain things in mind. You should always purchase an updated version that is also from a reputed distributor or dealer to avoid the risk of having Trojan or virus on your system. As the purchasing process gets over you need to start installing the antivirus. The installer in a series of screen usually provides instructions. All that you need is an internet connection to install the updated software.